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05 https://www.facebook.com/100064748293256/posts/pfbid02gFXAeYWXQsVrvCFWQTdnkxzsG8cQXsjBpqRSZBEUsCeT4ZtiTZaPfLokzsjFcikrl/?app= | 62 | 0 | Loading... |
06 ✅ Better than nothing.
ከምንም ይሻላል።
✅ Better late than never
ከመቅረት መዘግየት።
✅ I have nothing to say
ምንም የምለው የለኝም።
✅ We have nothing in common
ምንም የሚያመሳስለን ነገር የለም።
✅ He cares for nothing
ለምንም ነገር አይጨነቅም።
✅ She knows nothing about him
ስለሱ ምንም ምታውቀው ነገር የለም
✅ Nothing is impossible
የማይቻል ነገር የለም
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11 778 page ነው ምትፈልጉትን ቦታ ብቻ እያነበባቹ ✌️
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14 ✍️Notes on Environmental Chemistry:
🔹Components of Environment:
➖Atmosphere: This comprises a blanket of gaseous layer around earth.
➖Hydrosphere: This comprises about 96% of earth’s surface & includes all sources of water like oceans rivers lakes, glaciers, ground water etc.
➖Lithosphere: It refers to earth’s solid crust containing the outer mineral cover. It comprises soil, minerals, organic matter etc.
➖ Biosphere: It refers to the domain of living organism in covalent with atmosphere hydrosphere as well as lithosphere.
🔹Environmental Pollution :
Process of contamination of the environment with harmful wastes arising mainly from human activities.
➖Pollutant: Any substance or species produced either by a natural source or by human activity, which produces adverse effect on the environment.
➖Contaminant: A substance which does not occurs in nature but is introduced by human activity into the atmosphere affecting its composition.
➖Source: The site from which the pollution or contaminants originate.
➖Sink: The material or medium which consumes or interacts with a long lived pollutant is called sink.
➖Receptor : Anything that is affected by the pollutants.
➖Threshold limit value (TLV) : This indicates the permissible limit of a pollutant in atmosphere to which a healthy worker is exposed during hours a day or 40 hours a week for life time without any adverse effects. TLV are determined by experimentation on animals, by use of medical knowledge, epidemiology surveys & environmental studies.
🔹Tropospheric pollution or Air pollution:
It is the atmosphere condition in which the presence of certain concentration produce harmful effects on man and his environment. These substances include:
(i) Gases such as oxides of sulphur, CO, oxide of N2 and hydrocarbons
(ii) Particulate matter such as dust, smoke, fumes etc.
(iii) Radioactive material & many others.
➖Primary pollutants : These are the pollutants which are emitted directly from the sources. Some examples are:
➖Particulate Matter : Such as ash, smoke, dust, fumes etc.
➖Inorganic gases : Such as sulphur dioxide, carbon monoxide etc.
🔹Particulate matter:
➖Soot: produced by incomplete combustion of carbonaceous fossils fuels such as coal, fuel oil, natural gas, wood etc in insufficient supply of oxygen.
➖Metal particles: These are released by various metal finishing operation. The micro particles of toxic metal & SO2 gas present in the polluted atmosphere get absorbed on the particles rendering them highly toxic.
➖Metal oxides : They are generated by combustion of fuels containing metallic compounds.
➖Lead salts: Their source is lead tetraethyl (Pb(C2H5)4) which is added to gasoline to improve its antiknock property. In order to avoid deposition of PbO suitable amounts of C2H4Cl2 & C2H4Br2 are added to gasoline along with Pb(C2H5)4.
➖Fly ash: It originates from the combustion of high ash fossil. It contains partially burnt particles of the fuels.
➖Asbestos dust: It originates from industrial units manufacturing asbestos sheets, gaskets ropes etc. Asbestos flowing & asbestos insulations also contribute towards asbestos dust in the atmosphere.
➖Solid Hydrocarbons: These are emitted from petroleum refineries & comprise of paraffins, olefins & aromatics.
➖Dust Particulates: Originate from natural, domestic, industrial or agricultural sources. These are thrown into atmosphere by volcanic eruptions, blowing of dust by wind, mining operations etc.
➖Acid mist : Sulphuric acid mist is produced when SO3 present in the atmosphere comes in contact with moisture. Nitric acid mist is produced when oxides of nitrogen, viz, NO & NO2, undergo the series of reactions in the atmosphere.
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15 Sem I second round physics practicing question for Grade 12 students
© ODA in 2024/2016EC
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18 📄Physics properties of bulk matter EUEE 50 Questions
➖➖➖➖➖➖➖➖➖
ሌሎች ጥያቄዎችንና የንባብ ማቴሪያሎችን ለማግኘት ቻናላችንን ይቀላቀላሉ!
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19 📄Physics Chapter 8 Note
📄Vectors and Transformation of the Plane
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20 📄Physics Practice Questions
➖WAVE & SOUND
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21 📄 Biology EUEE 1478 Questions from Grade 9-12 , for Entrance Preparation.
✅ እነዚሀን ጥያቄዎች በደንብ ከሰራችሁ Biology አለቀለት 😊
📄 ለንባብ ሆነ ጥያቄ ለመስራት በጣም ቀለል ተደረጎ ለተማሪዎች የተዘጋጀ , ጥያቄዎች የሚጠይቀዉ ካዘጋጀላችሁ ኖት ሲሆን ለእያንዳንዱ ጥያቄዎች መልሶችን የያዘ! ☺️
➖➖➖➖➖➖➖➖➖
ሌሎች ጥያቄዎችንና የንባብ ማቴሪያሎችን ለማግኘት ቻናላችንን ይቀላቀላሉ!
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22 📄 Chemistry Atomic Structure
ትምህርት ሚኒስቴር
ተጨማሪ ትምህርታዊ መረጃ ለማግኘት ቻናላችን ይቀላቀሉ ‼️
https://t.me/Tmhrt_Minister
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Arsi University
Arsi University College of Education and Behavioral Science has offered training for Oromia Development Association (ODA) Boarding Secondary School Teachers and Students based at Adama City...
Repost from Learn English Language
✅ Better than nothing.
ከምንም ይሻላል።
✅ Better late than never
ከመቅረት መዘግየት።
✅ I have nothing to say
ምንም የምለው የለኝም።
✅ We have nothing in common
ምንም የሚያመሳስለን ነገር የለም።
✅ He cares for nothing
ለምንም ነገር አይጨነቅም።
✅ She knows nothing about him
ስለሱ ምንም ምታውቀው ነገር የለም
✅ Nothing is impossible
የማይቻል ነገር የለም
👇Join and share
@LEARN_ENGLISH_LANGUAGE_USA
@LEARN_ENGLISH_LANGUAGE_USA
@LEARN_ENGLISH_LANGUAGE_USA
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